大视场激光探测与告警技术

Large field laser detection and warning technology

利用四路红外非制冷焦平面探测器、大视场光学系统、窄带滤光片和信号处理系统,构成了凝视成像激光探测与告警系统.光学系统采用三片式结构的广角镜头来实现大视场;使用先进的非球面光学设计技术,并以FPGA完成探测器响应信号的非均匀校正,以改善像质;通过光学系统的畸变校正,提高激光的探测方向精度;利用激光和背景强度之间的反差,通过激光目标检测算法进行告警.实验表明,该系统能在127°视场范围内对波长为1.315μm, 2.7μm, 3.8μm, 10.6μm的4种激光进行告警,探测功率密度范围为0.05～50mW/cm2,探测方向精度可达1°.

A staring imaging laser detecting and warning system is formed by using 4-channel uncooled infrared focal plane detectors, large field optical system, narrow band filters and signal processing system. A wide-angle lens with three elements is used in the optical system to perform large field. The advanced aspheric optical design technique is used and the non-uniform correction for detector response is performed by FPGA for improving image quality. The detection direction accuracy for laser is improved through correcting distortion of the optical system. Based on the contrast between laser and background intensity, warning is carried out through laser target detection algorithm. The experimental results show that within a field range of 127 degree, four kinds of lasers with wavelengths of 1.315micron, 2.7micron, 3.8micron and 10.6micron can be detected. Its power density detected ranges from 0.05mW/cm2 to 50mW/cm2, and detection direction accuracy reaches 1 degree.